Metal-cutting tool.



Patented May 7,1918.

ATTORNEY.

EDMUND BURKE FIGURE, OF SPRINGFIELD, VERMONT.

METAL-CUTTING TGOL.

Specification of Letters Patent.

Patented May *7, 1918.

Application filed August 16, 1917. Serial No. 186,507.

To all whom it may concern Be it known that I, EDMUND B. Moore, a citizen of the United States, residing at Springfield, in the county of Windsor and- State of Vermont, have invented a new and useful Improvement in Metal-Cutting Tools, of which the following is a specification.

This invention relates to those tools which are designed to be mounted in the tool posts of lathes, planers, shapers and the like machines for cutting metal.

The object of the invention is to provide a very simple and cheap tool in which the cutting blade or hit may be quickly and rigidly secured in the supporting body or holder in such manner that the strains of use tend to increase the security and firmness of the bit in the holder and thus eliminate all danger of accidental loosening of the bit, and yet allow the bit to be easily adjusted in or removed from the holder when desired.

In attaining this end the supporting body or holder is provided with the usual longitudinally extending opening for the cylindrical cutting blade or hit and transversely extending opening for the cylindrical pin or key that locks the bit in place, the cylindrical bit having one side flattened on an angle to its axis and the cylindrical pin having one side flattened on an angle to its axis. These parts are put together in such manner that the inclined flattened surfaces of the bit and the pin cooperate for securely locking the bit in position in the holder.

Figure l of the accompanying drawings is a plan view of a tool which embodies this invention. Fig. 2 is an edge' view of the same. Fig. 3 shows an end view. Fig. 4: shows aside view of the cutting blade or bit. Fig. 5 shows a side view of the locking pin or key. Fig. 6 is a view looking at another side of the locking pin or key.

In the views 1 indicates the supporting body or holder of the tool which is formed of a substantial mass of steel and is designed to be clamped in the tool post of the machine with which the tool is to be used. In the front end of the holder is a cylindrical hole 2 that extends generally longitudinally but somewhat obliquely with relation to the axis of the holder. A short distance back from the front end of the holder is a transverse cylindrical hole 3 which cuts across the edge 5 of the hole 2.

The cutting blade or bit 4 is formed of a cylindrical rod of suitable steel and it is approximately of uniform diameter from end to end of such dimension that the bit has a close sliding fit in the hole 2. One side of this bit is limited oif obliquely to the axis of the bit, the flat increasing from the cutting end of the bit to the shank end so as to form a wedge surface 5. The locking pin or key 6 is made of a cylindrical piece of steel of approximately the diameter of the hole 3. One side of this locking pin is flatted OK on an incline to the axis of the pin so as to form a wedge surface 7 which increases from one end to the other.

The bit is first put into the oblique longi tudinal cylindrical hole 2 in the end of the holder in which it loosely fits, and when the bit is located in the desired place the pin is thrust into the cylindrical transverse hole 3 near the end of the holder until the flatted wedge surface on the pin engages the fiatted wedge surface on the bit and locks the bit in place. The pressure of the tool against the stock when in use tends to force the hit back into the holder. This force tends to wedge the bit more tightly against the wedge surface of the locking pin and thus increase the security and firmness of the anchoring of the bit in the holder. To remove the bit it is only necessary to knock back the lock pin. With this construction both of the holes in the holder, for the bit and for the lock pin, being cylindrical they are readily drilled by common tools. As the holes are cylindrical the bit and pin may be made from cheap and readily procurable steel rod, the only treatment to which they are subjectedbeing to flatten off the incline on the side of the bit and the side of the pin to form the cooperating wedges on the two parts. These flattened surfaces not only cooperate to first hold the bit in place when the pin is pushed in and tend to cause the bit to bind tighter as it is put to its work, but to hold the bit from turning in the holder while it is performing its cutting operation.

For the purpose of preventing the pin from dropping out and becoming lost a pin or screw 8 may be set in the holder with its end extending into a slot 9 cut in the pin. This allows the pin to move back and forth for looking or releasing the bit, but prevents the pin from accidentally dropping out of its hole in the holder.

The invention claimed is:

1. A metal cutting tool comprising a sup-.

porting body or holder having a cylindrical hole extending obliquely but substantially longitudinally in its front end and a cylindrical hole extending transversely near its front end and across the first mentioned hole, a cylindrical cutting blade or bit With a side flattened obliquely to the axis of and inclining away from the cutting end of the bit fitting the first mentioned hole, and a cylindrical locking pin or key With a side flattened obliquely to the axis of the pin fit ting the second mentioned hole, the flattened inclined surface of the bit cooperating with the flattened inclined surface of the pin for locking the bit securely in place.

2. A metal cutting tool comprising a supporting body or holder having a cylindrical Copies of this patent may be obtained for five cents each, by addressing Washington, D. 0.

hole extending obliquely but substantially longitudinally in its front end and a cylindrical hole extending transversely near its front end and across the first mentioned hole, a cylindrical cutting blade or bit With a side flattened obliquely to the axis of and inclining away from the cutting end of the bit fitting the first mentioned hole, a cylindrical locking pin or key With a side flattened obliquely to the axis of the pin fitting the second mentioned hole, the flattened i-nclined surface of the bit cooperating With the flattened inclined surface of the pin for locking the bit securely in place, and means for retaining the pin in its opening in the holder. I

EDMUND BURKE MOORE.

the Commissioner of jPatfits, 

